Live updates

Robert Katz, defending in court, denied that David Belmar had a fixation with the Queen or Buckingham Palace. He said Belmar had been on incapacity benefit for the past 10 years but that it was stopped after he was assessed in September:

He became very upset by that decision and he didn't know how he was going to cope

He added that Belmar did not brandish the knife and was not going to use it, but that he had:

A man armed with a six-inch kitchen knife was rugby-tackled to the ground by police outside Buckingham Palace after jumping over a barrier to try and see the Queen. 44-year-old David Belmar from Haringey in north London admitted to trespass at Westminster Magistrates' Court today.

David Belmar will stay in custody until he is sentenced following the incident at Buckingham Palace Credit: PA Wire

Belmar was watched by a crowd of around 20 tourists as he tried to run through the palace's north gate just before 11.30am on Monday. Edward Aydin, prosecuting, said: "In police custody, he said to police 'I wanted to see the Queen. I'm not happy about my benefits'."

He added that Belmar, who has mental health issues which he is taking medication for, has a fixation with the Queen and received a caution in 1989 for lighting fireworks and throwing them into the grounds of Buckingham Palace.